<if=input.show>
  <if=input.show>
    <div/el />
    <child=el />
  </if>
</if>

<child=el/>

<script>
  const first = el!()
  if (first) {
    first.innerHTML = 'Hello World';
  }
</script>

<hr />

<if=true>
  <div/el2 />
</if>

<script>
  const first = el2!()
  if (first) {
    first.innerHTML = 'Hello World';
  }
</script>